作者:Simon Pichette、Samuel Aubert-Nicol、Jean Lessard、Claude Spino
DOI:10.1002/ejoc.201101222
日期:2012.3
N-Mesyloxylactams can undergo ring contraction either by C-3 (usually observed) or C-5 migration. C-5 migration can occur when the C-3 migration product possesses ring strain, but it does not usually compete with C-3 migration. The greater preference for C-3 migration is due to the carbonyl oxygen atom, which greatly stabilizes the intermediate.
N-Mesyloxylactams 可以通过 C-3(通常观察到)或 C-5 迁移进行环收缩。当 C-3 迁移产物具有环应变时会发生 C-5 迁移,但它通常不与 C-3 迁移竞争。C-3 迁移的更大偏好是由于羰基氧原子,它极大地稳定了中间体。